Blocking transport resonances via Kondo entanglement in quantum dots

Abstract

Many-body entanglement is at the heart of the Kondo effect, which has its hallmark in quantum dots as a zero-bias conductance peak at low temperatures. It signals the emergence of a conducting singlet state formed by a localized dot degree of freedom and conduction electrons. Carbon nanotubes offer the possibility to study the emergence of the Kondo entanglement by tuning many-body correlations with a gate voltage. Here we quantitatively show an undiscovered side of Kondo correlations, which counterintuitively tend to block conduction channels: inelastic cotunneling lines in the magnetospectrum of a carbon nanotube strikingly disappear when tuning the gate voltage. Considering the global \SUT\ $\otimes$ \SUT\ symmetry of a carbon nanotube coupled to leads, we find that only resonances involving flips of the Kramers pseudospins, associated to this symmetry, are observed at temperatures and voltages below the corresponding Kondo scale. Our results demonstrate the robust formation of entangled many-body states with no net pseudospin.

9 pages, 4 figures

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• Feynman-Vernon influence functional approach to quantum transport in interacting nanojunctions: An analytical hierarchical study
• Intra- and inter-shell Kondo effects in carbon nanotube quantum dots
• Nonequilibrium finite frequency resonances in differential quantum noise driven by Majorana interference
• Carbon Nanotube Millikelvin Transport and Nanomechanics
• From Transparent Conduction to Coulomb Blockade at Fixed Hole Number
• A comprehensive study of out-of-equilibrium Kondo effect and Coulomb blockade
• Unhiding a concealed resonance by multiple Kondo transitions in a quantum dot
• Thermoelectric fluctuations of interfering Majorana bound states
• Coupling of shells in a carbon nanotube quantum dot
• Kondo effect in a two-dimensional electron gas in the Persistent Spin Helix regime